John Patrick McSherry was an American umpire in Major League Baseball who worked in the National League from 1971 to 1996. McSherry wore uniform number 9 when he entered the National League, then wore number 10 from 1979 through the rest of his career. A respected arbiter, he was one of several umpires who were noticeably overweight. McSherry was officially listed at 6'2" and 328 pounds, but some sources place his true weight close to 400 pounds. His weight may have been a major factor in causing his sudden cardiac death, which occurred behind home plate during the opening game of the 1996 major league season in Cincinnati on April 1, 1996.